Changes

To demonstrate that the roof could safely support more than a maximum of 150 mm of water, a structural load assessment was conducted by WSP Canada. This assessment concluded that ponding an average of 130 mm across CVC’s sloped roof applied a very similar force and torque distribution profile as ponding 130 mm across a completely flat roof. As such, it was considered safe to pond water at a depth of 75 mm at the parapet (roof edge) and 250 mm at the roof drains (lowest point) by the City of Mississauga, and an exemption was granted.

To demonstrate that the roof could safely support more than a maximum of 150 mm of water, a structural load assessment was conducted by WSP Canada. This assessment concluded that ponding an average of 130 mm across CVC’s sloped roof applied a very similar force and torque distribution profile as ponding 130 mm across a completely flat roof. As such, it was considered safe to pond water at a depth of 75 mm at the parapet (roof edge) and 250 mm at the roof drains (lowest point) by the City of Mississauga, and an exemption was granted.

The OBC specifies a maximum rooftop retention time of 24 hours because standing water can lead to the proliferation of algae, bacteria, and mosquitoes. To avoid the rise of water quality issues, the City of Mississauga required that CVC install a separate CSA-compliant water recirculation system on the third floor (see Figure 2). This system draws rooftop rainwater through the recirculation line that is immediately upstream of the east modulating control valve. The following are the main treatment components found on the third floor:

The OBC specifies a maximum rooftop retention time of 24 hours because standing water can lead to the proliferation of algae, bacteria, and mosquitoes. To avoid the rise of water quality issues, the City of Mississauga required that CVC install a separate CSA-compliant water recirculation system on the third floor. This system draws rooftop rainwater through the recirculation line that is immediately upstream of the east modulating control valve. The following are the main treatment components found on the third floor:

*'''Micron Filters:''' Remove any fine debris from the rainwater. This filtration is important for removing impurities, eliminating odours, and ensuring debris does not impede the efficacy of the ultra-violet treatment (UV) unit by blocking light. Two (2) filters are present, the first with a filter pore size of 20 μm and the second with a filter pore size of 5 μm – A pore size of 5 μm is required for CSA compliance.

*'''Micron Filters:''' Remove any fine debris from the rainwater. This filtration is important for removing impurities, eliminating odours, and ensuring debris does not impede the efficacy of the ultra-violet treatment (UV) unit by blocking light. Two (2) filters are present, the first with a filter pore size of 20 μm and the second with a filter pore size of 5 μm – A pore size of 5 μm is required for CSA compliance.